a = "one string";
b = string.gsub(a, "one", "another");

print(#a, a);
print(#b, b);

page = [[
  <html>
    <head>
      <title>Demo</title>
    </head>
    <body>
      ...
    </body>
  </html>
]];

-- 输出字符串的ascii列表
print(string.byte(a, 1, -1))

t = {string.byte(a, 1, -1)};

for i, v in ipairs(t) do
  print(i, v);
end

for i = 1, #t do
  print(t[i]);
end